Grass Lake Post Office
221 E Michigan Ave, Grass Lake, MI 49240
Retail Hours
| Sunday | Closed |
| Monday | 9:00 AM - 11:00 AM |
| Tuesday | 9:00 AM - 11:00 AM |
| Wednesday | 9:00 AM - 11:00 AM |
| Thursday | 9:00 AM - 11:00 AM |
| Friday | 9:00 AM - 11:00 AM |
| Saturday | 9:30 AM - 11:30 AM |
Contact Info
| Phone | 517-522-5139 |
| Fax | 517-522-3343 |
| TTY | 877-889-2457 |
| Toll Free | 1-800-275-8777 (1-800-Ask-USPS®) |
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